Those bands are called multiple moving averages or MMAs; they can be set to a chartist's desire. Most will set them as a 7 to 21-day upper and lower for cross-day traders or a 10 to 30-day upper lower for for a bullish candle swing trade. I know a lot of mates that swear by the 50 cross the 200 and good money can be made here, just look at examples on the web not saying it always works in ya favour. I've been pounding the pavement of late on here for a break in silver. The charts never lie
